The types of locks or latches you need are the same for door handles on a backplate, door handles on a rose and door knobs. For information on lock and latch sizes please see FAQ What backset size do I need?
• Internal doors. All non locking internal doors need a tubular latch, we supply a contract latch and a quality tubular latch, the difference being the overall quality and spring tension. The one that you purchase will generally be detemined by your budget. We always recommend the quality tubular latch as this feels solid and smooth in use whilst providing a long working lifespan. For unsprung door knobs (all Delamain door knobs are unsprung) we also recommend the Delamain door latch. This is a high quality door latch with a medium tension spring which will make the knobs easy to operate without being too stiff in use, *IMPORTANT* please see below for recommended latch sizes. • External locking doors. It is important that all external doors have either a BS certified 5 lever sashlock or a rim cyinder nightlatch used with a BS certified 5 lever deadlock. This is a minimum security standard required by most UK household insurance companies. If you do not have these fitted to your externa
